O'Brien Ford Mercury I bought my son's first car from O'Brien Ford Mercury in Shelbyville, Ky. I was concerned when buying a pre-owned vehicle, but after I looked at their BEST USED CAR GUARANTEE, i felt at ease. I found that no price is lower, no warranty is longer, no inspection program is as complete! When you shop at an O'Brien Dealership you know you're buying the BEST pre-owned vehicle available! For New Ford Vehicles or New Mercury Vehicles, or Pre-Owned Vehicles, O'Brien Ford Mercury of Shelbyville, Ky is the place to purchase your new or used cars!